AGENTS.md for contributors

[galesky-a]

Description
AGENTS.md files on the root of the repo will be focused on developers building the SDK, not users of the SDK.

Other options will be tested for users of the SDK.

Tested scenarios
Tested on a couple coding agents

[gemini-code-assist]

Summary of Changes

Hello @galesky-a, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the project's internal documentation by replacing the existing agents.md file, which previously targeted AI assistants and SDK users, with a new AGENTS.md. The new document is tailored to guide developers who are actively building and maintaining the Adyen Java API Library SDK, offering in-depth information on its architecture, code generation, development practices, and release procedures. This change clarifies the intended audience for this documentation, shifting the focus to SDK developers rather than end-users.

Highlights

• Documentation Restructuring: The previous agents.md file, which was geared towards AI assistants and SDK users, has been removed to streamline documentation.
• New Developer-Focused Guide: A new AGENTS.md file has been introduced, specifically designed to provide comprehensive guidance for developers building and maintaining the Adyen Java API Library SDK.
• Comprehensive SDK Development Details: The new AGENTS.md covers essential aspects such as the library's overview, detailed code generation processes (using OpenAPI Generator and adyen-sdk-automation), core architectural components, the standard development workflow (Maven build, testing, code style with Checkstyle and Spotless), and the automated release process.

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[gemini-code-assist]

Code Review

This pull request replaces the agents.md file, intended for AI assistants, with a new AGENTS.md file aimed at developers contributing to the SDK. The new documentation provides a clear and comprehensive guide on the development workflow, including code generation, building, testing, and release processes. The changes are well-structured and align with the goal of improving contributor documentation. I've added a couple of minor suggestions to enhance the new AGENTS.md file's clarity and adherence to common file formatting practices.